Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491..165p&link_type=abstract
Astrophysical Journal v.491, p.165
Astronomy and Astrophysics
Astronomy
4
Cosmology: Diffuse Radiation, Ism: Bubbles, Ism: Structure, X-Rays: Ism
Scientific paper
Forty-two ROSAT Position Sensitive Proportional Counter pointed observations in the first quadrant (l ~ 4 deg-26 deg) of the Galactic plane are mosaicked in order to study the spatial structure of the X-ray-emitting gas in the Local Hot Bubble (LHB). X-ray intensity variations at various angular scales are examined in the \frac {1}{4} keV band, and degree-scale variations are detected. In the context of the LHB and the displacement model for the origin of the \frac {1}{4} keV band background, the hardness ratio, angular size, and magnitude of the intensity variations suggest that at the +/-10% level there is an influence of a clumpy boundary structure superposed upon the emission from the uniformly distributed ~106 K plasma of the LHB interior. The possible origins of such a clumpy boundary structure of the LHB are discussed with Rayleigh-Taylor instabilities and clumping of the cooler interstellar medium at the boundary region being likely candidates.
Finley John P.
Park Sangwook
Snowden Steve L.
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